# Commission Decision of 30 May 2002 concerning the technical specification for interoperability relating to the control-command and signalling subsystem of the trans-European high-speed rail system referred to in Article 6(1) of Council Directive 96/48/EC (notified under document number C(2002) 1947) (Text with EEA relevance) (2002/731/EC), Division 4.1.1: BASIC PARAMETERS OF THE SUBSYSTEM: INTERNAL FUNCTIONS

Extent: E+W+S+N.I.

This section specifies the functions of control-command class A equipment that are essential to interoperability. The ETCS functions required for interoperability are:
the cab-signalling function,
the automatic train protection function, comprising:
selecting the speed supervision mode,
defining and providing the intervention function,
setting the train characteristics,
proving train integrity (note: rolling stock TSI is also concerned),
equipment health monitoring and failure mode support, comprising:
initialising the subsystem,
testing the subsystem in service,
testing the subsystem in depot,
providing failure mode support,
exchanging data between the trackside assembly and the on-board assembly,
managing the STMs,
support to cab-signalling and automatic train protection, comprising:
supporting driving,
providing odometry,
recording data,
the vigilance function.
To achieve interoperability it is not necessary to standardise all the functions within the whole control-command and signalling subsystem. The principle followed is the definition of:
trackside standard functions, able to read data from national interlocking and signalling systems and to translate such data into standard messages for the trains,
standard interfaces for track-to-train and train-to-track communication,
on-board standard functions, ensuring that every train will react to data received from trackside in a predictable way.
Only the above mentioned functionality is considered in this chapter.
The GSM-R functions required for interoperability are the voice and data communication between trackside and on-board.
In Annex A, index 0a, the ETCS functional requirement specifications are indicated.
In Annex A, index 0b, the GSM-R functional requirement specifications are indicated.
The control-command functions are classified in three categories:
M standard functions whose implementation is mandatory. For example: the ETCS end-of-movement authority,
O functions for which the implementation is optional, but if implemented a standard specification applies. For example: GSM-R fax transmission,
N functions of the national part of control-command. For example: interlocking functions.
The classification of the functions is indicated within the text of the ETCS FRS and the GSM-R FRS.
ETCS functions shall be implemented in accordance with the technical specifications indicated in Annex A, indices 5, 6, 7, 8, 9, and their performance shall conform to indices 2 and 18.
The vigilance function shall be implemented on-board in accordance with Annex A, index 10. Implementation may be:
outside the ERTMS/ETCS, with an optional interface to the ERTMS/ETCS equipment on-board, or
inside the ERTMS/ETCS on-board equipment.
The infill data transmission function in ETCS level 1 applications is only mandatory on-board under the conditions defined in section 7.
GSM-R radio functions shall be implemented in accordance with the technical specifications indicated in Annex A, index 11.

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Source: https://www.legislation.gov.uk/eudn/2002/731/annex/division/4/division/4.1/division/4.1.1 (the official version)
Page: https://openlegislation.uk/eu-decision-2002-731/annex/division-4/division-4.1/division-4.1.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.